∆                                                        
                                                               
                                                               
                                                               
             #                                                 
         ∆    .                                                
              #.                                               
             ##.##                                             
           #.#....                                             
           ......l##                                           
           #.......##                                          
           $.......<#   ∆                                      
           .........+                                          
           .........#                  ∆                       
           #.......##                                          
           ##.....##                                           
            ##...#                                             
            .....                   ∆                          
            .##.#   ∆                                          
                                                               
                                                               
                                                               
                                                               
                                                               
                                            ∆             ∆    
                                                               
                                                               
                                                               
                                                               
                                                               
                                                               
                                                               
                                                               
                                                               
                                                               
  ∆∆                                                           
                                                               
                                                               
                                                               
     ∆                                                     ∆   
                                                               
                                                               
      ∆                                                        
                                                  ∆            
                                                               
∆                                                              
                              ∆                                
                                                               
                                                               
             ∆                                                 
                                                               
                                                               
                                                               
                                                               
                                                               
                                                              ∆
               ∆                                               
                                                               
               ∆ ∆                                     ∆